LinuxPPC-Dev Archive on lore.kernel.org
 help / color / Atom feed
From: Halil Pasic <pasic@linux.ibm.com>
To: Christoph Hellwig <hch@lst.de>
Cc: linux-s390@vger.kernel.org, Mike Anderson <andmike@linux.ibm.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	Robin Murphy <robin.murphy@arm.com>,
	x86@kernel.org, Ram Pai <linuxram@us.ibm.com>,
	linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	"H. Peter Anvin" <hpa@zytor.com>,
	linux-fsdevel@vger.kernel.org,
	Thomas Gleixner <tglx@linutronix.de>,
	linuxppc-dev@lists.ozlabs.org,
	Alexey Dobriyan <adobriyan@gmail.com>,
	Thiago Jung Bauermann <bauerman@linux.ibm.com>,
	Marek Szyprowski <m.szyprowski@samsung.com>
Subject: Re: [PATCH 3/3] fs/core/vmcore: Move sev_active() reference to x86 arch code
Date: Fri, 12 Jul 2019 16:51:53 +0200
Message-ID: <20190712165153.78d49095.pasic@linux.ibm.com> (raw)
In-Reply-To: <20190712140812.GA29628@lst.de>

On Fri, 12 Jul 2019 16:08:12 +0200
Christoph Hellwig <hch@lst.de> wrote:

> On Fri, Jul 12, 2019 at 03:09:12PM +0200, Halil Pasic wrote:
> > This is the implementation for the guys that don't
> > have ARCH_HAS_MEM_ENCRYPT.
> > 
> > Means sev_active() may not be used in such code after this
> > patch. What about 
> > 
> > static inline bool force_dma_unencrypted(void)
> > {
> >         return sev_active();
> > }
> > 
> > in kernel/dma/direct.c?
> 
> FYI, I have this pending in the dma-mapping tree:
> 
> http://git.infradead.org/users/hch/dma-mapping.git/commitdiff/e67a5ed1f86f4370991c601f2fcad9ebf9e1eebb

Thank you very much! I will have another look, but it seems to me,
without further measures taken, this would break protected virtualization
support on s390. The effect of the che for s390 is that
force_dma_unencrypted() will always return false instead calling into
the platform code like it did before the patch, right?

Should I send a  Fixes: e67a5ed1f86f "dma-direct: Force unencrypted DMA
under SME for certain DMA masks" (Tom Lendacky, 2019-07-10) patch that
rectifies things for s390 or how do we want handle this?

Regards,
Halil


  reply index

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-12  5:36 [PATCH 0/3] Remove x86-specific code from generic headers Thiago Jung Bauermann
2019-07-12  5:36 ` [PATCH 1/3] x86/Kconfig: Move ARCH_HAS_MEM_ENCRYPT to arch/Kconfig Thiago Jung Bauermann
2019-07-12 16:04   ` Thomas Gleixner
2019-07-12 23:35     ` Thiago Jung Bauermann
2019-07-12  5:36 ` [PATCH 2/3] DMA mapping: Move SME handling to x86-specific files Thiago Jung Bauermann
2019-07-12  7:13   ` Christoph Hellwig
2019-07-12 23:42     ` Thiago Jung Bauermann
2019-07-12 16:09   ` Thomas Gleixner
2019-07-12  5:36 ` [PATCH 3/3] fs/core/vmcore: Move sev_active() reference to x86 arch code Thiago Jung Bauermann
2019-07-12 13:09   ` Halil Pasic
2019-07-12 14:08     ` Christoph Hellwig
2019-07-12 14:51       ` Halil Pasic [this message]
2019-07-12 15:11         ` Christoph Hellwig
2019-07-12 15:42           ` Halil Pasic
2019-07-13  8:08             ` Christoph Hellwig
2019-07-12 21:55     ` Thiago Jung Bauermann
2019-07-15 14:03       ` Halil Pasic
2019-07-15 14:30         ` Christoph Hellwig
2019-07-15 15:44           ` Lendacky, Thomas
2019-07-15 20:14           ` Thiago Jung Bauermann
2019-07-13  4:45 [PATCH 0/3] Remove x86-specific code from generic headers Thiago Jung Bauermann
2019-07-13  4:45 ` [PATCH 3/3] fs/core/vmcore: Move sev_active() reference to x86 arch code Thiago Jung Bauermann

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20190712165153.78d49095.pasic@linux.ibm.com \
    --to=pasic@linux.ibm.com \
    --cc=adobriyan@gmail.com \
    --cc=andmike@linux.ibm.com \
    --cc=bauerman@linux.ibm.com \
    --cc=bp@alien8.de \
    --cc=hch@lst.de \
    --cc=hpa@zytor.com \
    --cc=iommu@lists.linux-foundation.org \
    --cc=konrad.wilk@oracle.com \
    --cc=linux-fsdevel@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-s390@vger.kernel.org \
    --cc=linuxppc-dev@lists.ozlabs.org \
    --cc=linuxram@us.ibm.com \
    --cc=m.szyprowski@samsung.com \
    --cc=mingo@redhat.com \
    --cc=robin.murphy@arm.com \
    --cc=tglx@linutronix.de \
    --cc=x86@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

LinuxPPC-Dev Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linuxppc-dev/0 linuxppc-dev/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linuxppc-dev linuxppc-dev/ https://lore.kernel.org/linuxppc-dev \
		linuxppc-dev@lists.ozlabs.org linuxppc-dev@ozlabs.org linuxppc-dev@archiver.kernel.org
	public-inbox-index linuxppc-dev


Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.ozlabs.lists.linuxppc-dev


AGPL code for this site: git clone https://public-inbox.org/ public-inbox